<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
	</body>
	<script type="text/javascript">
		var reg = /^1\d{10}$/;
		var reg2 = /^1[0-9]{10}$/;
		var reg3 = /^1[35789]\d{9}$/;
		
		var str = "18220550305";
		
		console.log(reg3.test(str));
		
	</script>
</html>
